Abrading-machine.



- 'NO. 737,270. PATENTED AUG.25,1903.

L. PETERSON.

ABRADING MACHINE.

I APPIJIOATION rn-nn 110mm. 1902'. no MODEL. a sHBnTssHBnT 1.

PATBNTED' AUG. 25, 19'0'3.

L. PETERSON. ABRADING MACHINE.

' APPLIO ATION PILED NOV. 28, 1902 3 SHEETS-SHEET 2.

N0 MODEL.

in w [M115 14 a 7 PM i wifim HEN w x mw No. 737,270. PATENTED Aueh'za, 1903. L. PETERSON. ABRADING MACHINE.

APPLICATION FILED NOV. 2B, 1902. 10 MODEL. a snn'rssnnm a.

"UNITED STATES Patented. August 25, 1903.

PATENT OFFICE.

CHESTER B. WILLIAMS,

OF CHICAGO, ILLINOIS.

ABRADlNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 737,270, dated August 25, 1903.

Application filed l Iovember 28, 1902. Serial No. 133,043. N m el hereby declare that the following isja full,

- clear, and exact description thereof,'reference being had to the accompanying drawings,and

to the letters of reference marked thereon, which form a part of this specification.

This invention relatesto improvements in" abrading-machines or machines for polishing the surfaces of boards and other articles; and the invention consists in the matters hereinafter set forth, and more particularly pointed out in the appended claims.

In the drawings, Figure 1 is aside elevation of a machine made in accordance with my invention with partsbroken away. Fig. 2 is a top plan view thereof with parts broken away.

Fig. 3 is a vertical section taken on line 3 3 of Fig. 1. Fig. 4 is a partial longitudinal section taken transversely through the abrading and presser rollers. Fig. 5 is a perspective view of one of the links of the feed-chain. j

As shown in said drawings, the frame of the machine consists of two side members A A, provided at their ends with legs or standards A, and a horizontalwork-table B, which extends horizontally between said side members from end to end thereof and is supported'on longitudinal shoulders or flanges B on the inner sides of the frame members A. The ends of said table are shown as turned downwardly to afford cross-braces for the frame, and said frame is further braced by means of crossbraces B as shown in Figs. 3 and 4.

C C designate two transversely-arranged abrading-rollers, located,preferably, near the delivery end of the machine. Said rollers are provided with abrading-surfaces, which may be formed bysheets'c c of sandpaper or the like applied to the surface of the rollers. The.

plied tothe upper surface of the work-table 'at the part thereof adjacent to the abradingrollers O, and the plates are provided with slots through which the abrading-rollers pro ject. Said plate is seated in said work-table, flush with the upper surface thereof. The table B proper may be made of wood and the transversely across and above the table. The

shafts of said presser-rollers are seated in vertically and yieldingly movable bearings at each side of the machine-frame. As herein shown, four rollers are provided, one being located above the table on each side of each abrading-roller. As herein shown, the shafts D of said presser-rollers are mounted in bearing blocks (1, which are supported in and have vertical sliding engagement with slotted guides E, attached to and rising from the side members of the frame, and said presser-rollers are held yieldingly againstthe table by means of spiral springs E, located in said slotted guides. The strength of said springs is adapted to be varied bymeans of adj ustingscrews 6, extending through the-upper parts of the guides and engaging followers 6, which bear against the upper ends of the springs.

Located at the sides of the table B are traveling feed-belts F F, which have the form of endless-chain belts. Said belts are trained over sprocket-wheels F F, located at the opposite ends of the machine, said wheels being affixed to transverse shafts F F mounted at their ends in the side members of the frame. The upper laps of the feed-chains move in horizontal longitudinal guide grooves or depressions a, formed in the side margins of the table, as clearly shown in Figs. 2 and 3. Said guide-depressions terminate short of the ends of the table, andthe feed-chains pass beneath the table for engagement with the sprocket wheels in' the 'manner" clearly shown in Figs. 2 and 4:. The chains F are level of the table and are adapted to engage the rear end of a piece of work or a transverse bar or strip extending across the table in rear of the work in a manner to thrust or carry the articles forwardly on the table and over the abrading-rollers. If the work to be operated upon is sufficiently wide to extend from one feed-chain to the other, the lugs f are engaged directly with the work. In the event that the work is narrower than the distance between the chains loose cross-strips G are employed, Fig. 2, which are placed across the table and in contact with the rear end or part of the work and engaged at their ends with the front faces of corresponding or opposite lugs f of the chain. In this manner the work is fed or advanced through the medium of the lugs on the chains and the crossstrip G.

The shafts of the abrading-rollers are provided outside of the machine-frame with pulleys 0 0 about which are trained driving belts 0 said belts being so driven as to turn the rollers in such direction that their upper surfaces move toward the advancing work, as shown in Fig. 1. Said rollers are driven at a greater surface speed than that of the feed-chains, and, as herein shown, said feedchains are driven through operative connections with the pulleys C of the abradingrollers. Said construction is herein illustrated as made as follows:

H, Fig. 1, designates a pulley which is affixed to a shaft H, supported in suitable bearings in the side member of the frame, and H designates a smaller pulley, which is likewise afiixed to the end of the shaft H outside of the pulley H. The pulley H is connected with a pulley c, which is affixed to the shaft 0 of one of the abrading-rollers by means of a belt H trained about said pulleys.

I designates a pulley which is affixed to a shaft 1, extending transversely across the front end of the machine-frame, and said pulley I is connected with the pulley H by means of a belt 1 The shaft 1 is provided inside of the driving-pulley I with a second pulley 1 which is connected, by means of a twisted belt I, with a pulley F, which is affixed to the front shaft F of the mechanism for advancing the feed-belts. Through the means described the feed-chain is actuated from the pulley of the abrading-rollers at a lower speed and in a reverse direction with respect to the abrading-rollers.

Provision is made for giving continuous endwise reciprocatory movement to the abrading-rollers C during their rotation for the purpose of preventing the abrading-rollers cutting grooves in the work passed thereover. The last-mentioned construction, as illustrated herein, is made as follows:

The shaft 1 is provided at one end thereof with a cam-roller J, provided on its periphery with a cam-groove j.

K designates an oscillating lever which is pivoted between its ends so as to swing horivsmvo zontally on a bracket or projection K, extending laterally from the adjacent side mcn1- ber of the machine. Said oscillating lever bears at its ends against the ends of the abrading-roller shafts G C.

L designates a second vibratory rock-lever which is pivoted between its ends on abracket L so as to swing in a horizontal plane. Said bracket is shown as attached to the adjacent side member of the machine-frame. Said lever L is provided at one end with a lug Z, which engages the cam-groovej of the roller J, and is pivoted or loosely connected at its other end with the adjacent end of the oscillating lever K.

M M designate two horizontal spring-arms, which are located at the side of the machineframe, remote from the oscillating lever L. Said spring-arms bear at their ends against the ends of said shaft 0. Said spring-arms are desirably connected with each other end to end, so as to forma single part or member on which is formed two lugs m, which are fitted-upon alug a on the machine-frame, as indicated in said Fig. 2, and connected with the same by means of a pin m, eXtendin g vertically through said parts. Said pin serves as a pivot on which the spring-arms swing or oscillate. The said spring-arms arranged as described serve to hold the roller-shafts c011- stantly pressed against the oscillating lever K, while at the same time they rock or oscillate to correspond with the movement of the lever K. Manifestly the said spring-arms need not necessarily have pivotal connection with the frame, and in that case they would have no swinging or oscillatory movement; but the construction described is preferred, because requiring less fleXure of the arms in the endwise movement of the roller-shafts, while at the same time they serve to always hold the said shafts in close contact with the lever K and prevent lost motion between the said lever and the ends of the shafts. With this construction rotation of the cam-roller J acts through the connecting-lever L to give a rocking movement to the leverK, which latter lever acts on the shafts O of the abrading-rollers C to alternately force said rollers toward the side of the machine remote from said rock-lever K, the spring-arms M M serving to give reverse movement to the rollers, and thus imparting an alternating endwise reciprocatory movement to the rollers during the rotation thereof.

The equipment of the machine with compression-rollers adapts the same for polishing or making smooth relatively thin boards and the like. The machine may, however, be adapted for polishing assembled articles,such as boxes, by removing the presser-rollers and forcing said articles against the abradingrollers, either manually or by suitable mechanical means, while the articles being polished are carried forwardly by the feedchain F.

It is obvious that changes maybe made in the details of the machine without departing from the spirit of my invention, and I do not wish to be limited thereto except as hereinafter made the subject of specific claims.

I claim as my invention- 1. An abrading-machine comprisinga horizontal table provided with a transverse slot, a horizontal bearing-roller, the upper part of which extends upwardly through said slot, endless parallel feeding-belts located one at each side of the table for advancing the work, pressure-rollers located above said table and one on each side of the abrading-roller, a separate spring device for each pressure-roller which act to press said rollers toward said table whereby the pressure-rollers are separately yieldable toward the table.

2. An abrading-machine comprising a horizontal table provided with a transverse slot, a horizontal bearing-roller, the upper part of which extends upwardly through said slot, endless parallel feeding-belts located one at each side of the table for advancing the work, pressure-rollers located above said table and one on each side of the abrading-roller, a separate spring device for each pressure-roller which act to press said rollers toward said table whereby the pressure-rollers are separately yieldable toward the table, and means for imparting endwise reciprocation of said abrading-roller.

3. An abrading-machine comprising a horizontal table provided with a separate wearing-plate made of a material more durable than the table, said wearing-plate being provided with a slot and an abrading-roller, the

upper part of which extends upwardly through said slot, endless parallel feed-belts located one on each side of the table for advancing the work through the machine, pressure-rollers located above said table one on each side of the abrading-roller and spring devices which act separately on said rollers to press the same toward the abrading-roller and said table.

4. An abrading-machine comprising a horizontal table, two parallel horizontal abradingrollers extending upwardly through slots in said table, means for feeding thework'to saidrollers, and means for imparting endwise're ciprocatory movement to said rollers, .embracing a lever pivoted between its ends and actinge'ndwise against said rollers, means for actuating said lever comprising a rotative cam-roller provided with a peripheral camgroove and a pivoted connecting-lever connected at one end with said first-mentioned lever and having a lug at its other end adapt ed for engagement with said cam-groove.

5. An abrading-machine comprising a horizontal table,two parallel horizontal rollers extending upwardly through transverse slots on said table, means for feeding the work to said rollers, and means for imparting endwise reciprocatory movement to the rollers embracing a lever pivoted between its ends and acting endwise against said rollers, means for actuating said lever and a spring or springs acting on the abrading-rollers in opposition to said lever.

6. An abrading-machine comprising a horizontal table, two parallel horizontal rollers extending upwardly through slots in said table, means for feeding the work to said rollers, and means for imparting endwise reciprocatorymovement to the rollers embracing a lever pivoted between its ends and acting endwise against said rollers, means for actuating said lever and rigidly-connected spring-arms pivoted to the machineframe and acting endwise against the abrading-rollers in opposition to said lever.

In testimony that I claim the foregoing as my invention I affix my signature, in'presence of two witnesses, this 4th day of June, A. D. 1902.

. LEONARD PETERSON.

Witnesses:

WILLIAM L. HALL, GEORGE R. WILKINS. 

